A Novel Transient Directional Unit Based on Adaptive Median Filtering

Abstract:

A new transient directional unit for extra high voltage(EHV) power transmission lines is proposed, which identifies fault direction by means of comparing the time-domain transient energy of the forward traveling-wave with that of the backward one in the very short period of time after fault occurs. The unit algorithm is designed with the technology of adaptive median filtering, which is first employed to process the forward and backward traveling-waves, and then calculates the time-domain transient energy ratio of the forward traveling-wave to the back one, by which the fault direction is discriminated. Numerous ATP-EMTP simulation tests show that this proposed directional unit not only operates reliably, sensitively and ultra-high-speed, but also endure the influences of various factors, including different fault types, fault locations, transition resistances or fault inception angles. It will be worthy of application greatly.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 4500-4505
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.4500
• Online since: January 2012
• Authors: Ren Wang He, Yi Bo Yang
• Keywords: Adaptive Median Filtering, Transient Directional Unit, Transient Energy, Traveling Wave

References

[1] Johns A T, Martin M A, Barker A, et al. A new approach to EHV direction comparison protection using digital signal processing techniques[J]. IEEE Trans. on Power Delivery, 1986, 1(4): 24-34.

DOI: 10.1109/tpwrd.1986.4307930

[2] Chamia M, Liberman S. Ultra high speed relay for EHV/UHV transmission lines-development, design and application[J]. IEEE Trans on PAS, 1978, 97(6): 2104-2112.

DOI: 10.1109/tpas.1978.354714

[3] Mansour M M, Swift G W. A multi-microprocessor based travelling wave relay-theory and realization[J]．IEEE Trans on Power Delivery, 1986, 1(1): 272-279.

DOI: 10.1109/tpwrd.1986.4307919

[4] Duan Jiandong, Zhang Baohui, Zhouyi. Study of ultra-high-speed transient-based directional relay[J]. Proceedings of the CSEE, 2005, 25(4): P7-12(Ch).

[5] Duan Jiandong, Zhang Baohui, Li Peng, et al. Principle and algorithm of non-unit transient-based protection for EHV transmission lines[J]. Proceedings of the CSEE, 2007, 27(7): P45-51(Ch).

[6] Luo Sibei, Zhang Baohui, Cao Ruifeng, Duan Jiandong. Ultra-high-speed transient directional unit based on median filtering[J]. Proceedings of the CSEE, 2007, 27(34): P64-69(Ch).

[7] Nodes T A, Gallagher N C Jr. The output distribution of median type filters[J]．IEEE Trans on Communications, 1984, 32(5): 532-541.

DOI: 10.1109/tcom.1984.1096099